• 상하수도학회지
• /
• 제35권6호
• /
• pp.379-387
• /
• 2021

In general, trans-membrane pressure (TMP), flux, filtration resistance are used as indicators to evaluate the degree of fouling in MBR. However, they have limitations in determining the level of EPS generation, which is known as an important factor of fouling. Therefore, a new evaluation method is required to monitor the amount of EPS generation. In this study, the applicability of capillary suction time (CST), which is used to measure the dewaterability of sludge, was evaluated as an indirect fouling evaluation index. Statistical analysis was performed to evaluate the effect of EPS on CST, and to determine whether EPS has high similarity with representative fouling evaluation indicators and CST, and quantitatively compared them. As a result, the correlation coefficient between CST and bEPS was 0.7988, which was higher than the correlation coefficient between filtration resistance and bEPS. Since bEPS is a major factor inducing fouling by affecting the formation of the cake layer, it was evaluated that CST, which has a high correlation with bEPS, is suitable to represent EPS. In addition, it was evaluated that the correlation coefficient between filtration resistance and CST was high as 0.7187, which could be used as a fouling evaluation index.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2007년도 춘계학술발표논문집
• /
• pp.287-290
• /
• 2007

We investigated the effect of ultrasound on the dewaterability of sewage sludge. Because, dewatering and disposal of waste sludge is a major economical factor in the operation of wastewater treatment plants. Capillary Suction Time(CST) and Specific Resistance to Filtration (SRF) were used to evaluate the sludge dewatering behaviors. From the results of the experiment, it was found that ultrasonic treatment can improve the dewaterability. We discovered that CST and SRF were highly related, according to the correlation coefficient($R^{2}$).

• 한국산학기술학회논문지
• /
• 제8권4호
• /
• pp.874-880
• /
• 2007

CST와 SRF는 슬러지 탈수효율 인자로 가장 널리 사용되고 있다. 이러한 CST와 SRF는 각각의 분석특징의 장.단점으로 인해 실험방법 및 결과 해석시, 슬러지 탈수의 최적조건을 찾아 예측하는데 어려움이 있다. 따라서 본 연구는 탈수성 지표로 이용되는 CST와 SRF의 이론식 가운데 CST와 SRF의 상호관계식을 유도하여 각각의 실측값과 예측값을 비교한 후 비교적 측정이 간편한 CST 시험만으로도 탈수최적조건을 도출할 수 있는 이론식을 검토하였다.

• 유기물자원화
• /
• 제17권1호
• /
• pp.96-102
• /
• 2009

본 연구에서는 혐기성 소화 성능 향상을 위해 초음파 및 알칼리 전처리에 의한 폐활성 슬러지의 가용화 효과를 조사하였다. 초음파 및 알칼리 전처리는 세포벽의 파괴로 인하여 모세관 흡입 시간을 증가시킬 뿐만 아니라 상등액의 용존성 화학적 산소요구량, 단백질 및 탁도 농도를 증가키는 것으로 나타났다. 알칼리와 초음파 전처리를 병행한 슬러지 가용화가 초음파 전처리만을 수행한 경우에 비해 용존성 화학적 산소요구량과 단백질 증가가 높은 것으로 나타났다. 알칼리와 초음파 전처리를 동시에 수행한 경우 폐활성 슬러지의 고형물 농도 증가에 따라 가용화 효율이 감소하는 것으로 조사되었다.